diff --git a/core/includes/form.inc b/core/includes/form.inc
index 1c73977..0dc2ab2 100644
--- a/core/includes/form.inc
+++ b/core/includes/form.inc
@@ -1856,22 +1856,6 @@ function form_builder($form_id, &$element, &$form_state) {
     '#title_display' => 'before',
   );
 
-  // Checks if the element needs property validation.
-  if (isset($element['#property_validate']) && is_array($element['#property_validate'])) {
-    // Validates required properties.
-    foreach ($element['#property_validate'] as $property => $callbacks) {
-      foreach ($callbacks as $callback) {
-        if (!isset($element[$property]) || !$callback($element)) {
-          trigger_error(t("'@type' element in form '@form_id' has a non-valid '@property' property.", array(
-            '@type' => $element['#type'],
-            '@form_id' => $form_id,
-            '@property' => $property,
-          )), E_USER_ERROR);
-        }
-      }
-    }
-  }
-
   // Special handling if we're on the top level form element.
   if (isset($element['#type']) && $element['#type'] == 'form') {
     if (!empty($element['#https']) && settings()->get('mixed_mode_sessions', FALSE) &&
@@ -1923,6 +1907,23 @@ function form_builder($form_id, &$element, &$form_state) {
     $element['#processed'] = TRUE;
   }
 
+  // Checks if the element needs property validation.
+  if (isset($element['#property_validate']) && is_array($element['#property_validate'])) {
+    // Validates required properties.
+    foreach ($element['#property_validate'] as $property => $callbacks) {
+      foreach ($callbacks as $callback) {
+        if (!isset($element[$property]) || !$callback($element)) {
+          trigger_error(t("'@type' element in form '@form_id' has a non-valid '@property' property in @parents.", array(
+            '@type' => $element['#type'],
+            '@form_id' => $form_id,
+            '@property' => $property,
+            '@parents' => '$form[\'' . implode('\'][\'', $element['#parents']) . '\']',
+          )), E_USER_ERROR);
+        }
+      }
+    }
+  }
+
   // We start off assuming all form elements are in the correct order.
   $element['#sorted'] = TRUE;
 
@@ -3616,6 +3617,7 @@ function form_process_tableselect($element) {
             '#parents' => $element['#parents'],
             '#id' => drupal_html_id('edit-' . implode('-', $parents_for_id)),
             '#ajax' => isset($element['#ajax']) ? $element['#ajax'] : NULL,
+            '#property_validate' => array(),
           );
         }
         if (isset($element['#options'][$key]['#weight'])) {
diff --git a/core/modules/action/lib/Drupal/action/ActionFormControllerBase.php b/core/modules/action/lib/Drupal/action/ActionFormControllerBase.php
index ff48164..f14b05f 100644
--- a/core/modules/action/lib/Drupal/action/ActionFormControllerBase.php
+++ b/core/modules/action/lib/Drupal/action/ActionFormControllerBase.php
@@ -79,7 +79,6 @@ public function form(array $form, array &$form_state) {
 
     $form['id'] = array(
       '#type' => 'machine_name',
-      '#title' => t('Machine name'),
       '#default_value' => $this->entity->id(),
       '#disabled' => !$this->entity->isNew(),
       '#maxlength' => 64,
diff --git a/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockTypeFormController.php b/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockTypeFormController.php
index c9029a3..cf88f5d 100644
--- a/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockTypeFormController.php
+++ b/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockTypeFormController.php
@@ -31,7 +31,6 @@ public function form(array $form, array &$form_state) {
     );
     $form['id'] = array(
       '#type' => 'machine_name',
-      '#title' => t('Machine name'),
       '#default_value' => $block_type->id(),
       '#machine_name' => array(
         'exists' => 'custom_block_type_load',
diff --git a/core/modules/block/lib/Drupal/block/BlockFormController.php b/core/modules/block/lib/Drupal/block/BlockFormController.php
index f562a68..8e25268 100644
--- a/core/modules/block/lib/Drupal/block/BlockFormController.php
+++ b/core/modules/block/lib/Drupal/block/BlockFormController.php
@@ -29,7 +29,6 @@ public function form(array $form, array &$form_state) {
 
     $form['machine_name'] = array(
       '#type' => 'machine_name',
-      '#title' => t('Machine name'),
       '#maxlength' => 64,
       '#description' => t('A unique name to save this block configuration. Must be alpha-numeric and be underscore separated.'),
       '#default_value' => $entity->id(),
diff --git a/core/modules/entity/lib/Drupal/entity/Form/EntityDisplayModeFormBase.php b/core/modules/entity/lib/Drupal/entity/Form/EntityDisplayModeFormBase.php
index 787432a..615448f 100644
--- a/core/modules/entity/lib/Drupal/entity/Form/EntityDisplayModeFormBase.php
+++ b/core/modules/entity/lib/Drupal/entity/Form/EntityDisplayModeFormBase.php
@@ -73,7 +73,6 @@ public function form(array $form, array &$form_state) {
 
     $form['id'] = array(
       '#type' => 'machine_name',
-      '#title' => t('Machine-readable name'),
       '#description' => t('A unique machine-readable name. Can only contain lowercase letters, numbers, and underscores.'),
       '#disabled' => !$this->entity->isNew(),
       '#default_value' => $this->entity->id(),
diff --git a/core/modules/node/lib/Drupal/node/NodeTypeFormController.php b/core/modules/node/lib/Drupal/node/NodeTypeFormController.php
index 251eea4..ec465e1 100644
--- a/core/modules/node/lib/Drupal/node/NodeTypeFormController.php
+++ b/core/modules/node/lib/Drupal/node/NodeTypeFormController.php
@@ -49,7 +49,6 @@ public function form(array $form, array &$form_state) {
 
     $form['type'] = array(
       '#type' => 'machine_name',
-      '#title' => t('Machine name'),
       '#default_value' => $type->id(),
       '#maxlength' => 32,
       '#disabled' => $type->isLocked(),
diff --git a/core/modules/system/lib/Drupal/system/Form/DateFormatFormBase.php b/core/modules/system/lib/Drupal/system/Form/DateFormatFormBase.php
index 4d347c5..5c22f7c 100644
--- a/core/modules/system/lib/Drupal/system/Form/DateFormatFormBase.php
+++ b/core/modules/system/lib/Drupal/system/Form/DateFormatFormBase.php
@@ -132,7 +132,6 @@ public function form(array $form, array &$form_state) {
 
     $form['id'] = array(
       '#type' => 'machine_name',
-      '#title' => t('Machine-readable name'),
       '#description' => t('A unique machine-readable name. Can only contain lowercase letters, numbers, and underscores.'),
       '#disabled' => !$this->entity->isNew(),
       '#default_value' => $this->entity->id(),
diff --git a/core/modules/system/tests/modules/ajax_forms_test/ajax_forms_test.module b/core/modules/system/tests/modules/ajax_forms_test/ajax_forms_test.module
index 1682c01..80653da 100644
--- a/core/modules/system/tests/modules/ajax_forms_test/ajax_forms_test.module
+++ b/core/modules/system/tests/modules/ajax_forms_test/ajax_forms_test.module
@@ -49,6 +49,7 @@ function ajax_forms_test_simple_form($form, &$form_state) {
 
   $form = array();
   $form['select'] = array(
+    '#title' => t('Color'),
     '#type' => 'select',
     '#options' => array(
       'red' => 'red',
diff --git a/core/modules/user/user.admin.inc b/core/modules/user/user.admin.inc
index bb486ff..1fafdb0 100644
--- a/core/modules/user/user.admin.inc
+++ b/core/modules/user/user.admin.inc
@@ -4,6 +4,7 @@
  * @file
  * Admin page callback file for the user module.
  */
+use Drupal\Component\Utility\String;
 
 /**
  * Page callback: User administration page.
@@ -143,7 +144,7 @@ function user_admin_permissions($form, $form_state, $rid = NULL) {
           'restrict access' => FALSE,
           'warning' => !empty($perm_item['restrict access']) ? t('Warning: Give to trusted roles only; this permission has security implications.') : '',
         );
-        $options[$perm] = '';
+        $options[$perm] = $perm_item['title'];
         $user_permission_description = array(
           '#theme' => 'user_permission_description',
           '#permission_item' => $perm_item,
@@ -167,6 +168,7 @@ function user_admin_permissions($form, $form_state, $rid = NULL) {
   // Have to build checkboxes here after checkbox arrays are built
   foreach ($role_names as $rid => $name) {
     $form['checkboxes'][$rid] = array(
+      '#title' => String::checkPlain($name),
       '#type' => 'checkboxes',
       '#options' => $options,
       '#default_value' => isset($status[$rid]) ? $status[$rid] : array(),
@@ -229,6 +231,7 @@ function theme_user_admin_permissions($variables) {
         $form['checkboxes'][$rid][$key]['#title_display'] = 'invisible';
         $row[] = array('data' => drupal_render($form['checkboxes'][$rid][$key]), 'class' => array('checkbox'));
       }
+      hide($form['checkboxes']);
     }
     $rows[] = $row;
   }
diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/display/PathPluginBase.php b/core/modules/views/lib/Drupal/views/Plugin/views/display/PathPluginBase.php
index 57691f1..79795d2 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/display/PathPluginBase.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/display/PathPluginBase.php
@@ -305,6 +305,7 @@ public function buildOptionsForm(&$form, &$form_state) {
         $form['#title'] .= t('The menu path or URL of this view');
         $form['path'] = array(
           '#type' => 'textfield',
+          '#title' => t('Path'),
           '#description' => t('This view will be displayed by visiting this path on your site. You may use "%" in your URL to represent values that will be used for contextual filters: For example, "node/%/feed".'),
           '#default_value' => $this->getOption('path'),
           '#field_prefix' => '<span dir="ltr">' . url(NULL, array('absolute' => TRUE)),
diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/filter/FilterPluginBase.php b/core/modules/views/lib/Drupal/views/Plugin/views/filter/FilterPluginBase.php
index 60ba107..aa40b27 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/filter/FilterPluginBase.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/filter/FilterPluginBase.php
@@ -8,6 +8,7 @@
 namespace Drupal\views\Plugin\views\filter;
 
 use Drupal\views\Plugin\views\HandlerBase;
+use Drupal\Component\Utility\String;
 use Drupal\views\Plugin\views\display\DisplayPluginBase;
 use Drupal\Component\Annotation\Plugin;
 use Drupal\views\ViewExecutable;
@@ -748,6 +749,7 @@ public function groupForm(&$form, &$form_state) {
       $value = $this->options['group_info']['identifier'];
 
       $form[$value] = array(
+        '#title' => String::checkPlain($this->options['group_info']['label']),
         '#type' => $this->options['group_info']['widget'],
         '#default_value' => $this->group_info,
         '#options' => $groups,
@@ -788,10 +790,6 @@ public function buildExposedForm(&$form, &$form_state) {
       $this->operatorForm($form, $form_state);
       $form[$operator] = $form['operator'];
 
-      if (isset($form[$operator]['#title'])) {
-        unset($form[$operator]['#title']);
-      }
-
       $this->exposedTranslate($form[$operator], 'operator');
 
       unset($form['operator']);
@@ -801,11 +799,11 @@ public function buildExposedForm(&$form, &$form_state) {
     if (!empty($this->options['expose']['identifier'])) {
       $value = $this->options['expose']['identifier'];
       $this->valueForm($form, $form_state);
-      $form[$value] = $form['value'];
-
-      if (isset($form[$value]['#title']) && !empty($form[$value]['#type']) && $form[$value]['#type'] != 'checkbox') {
-        unset($form[$value]['#title']);
+      // If no title was specified, prevent validation errors.
+      if (!isset($form['value']['#title']) || trim($form['value']['#title']) == '') {
+        $form['value']['#property_validate']['#title'] = array();
       }
+      $form[$value] = $form['value'];
 
       $this->exposedTranslate($form[$value], 'value');
 
diff --git a/core/modules/views/tests/modules/views_test_data/views_test_data.views_execution.inc b/core/modules/views/tests/modules/views_test_data/views_test_data.views_execution.inc
index e5a4277..701624b 100644
--- a/core/modules/views/tests/modules/views_test_data/views_test_data.views_execution.inc
+++ b/core/modules/views/tests/modules/views_test_data/views_test_data.views_execution.inc
@@ -18,7 +18,7 @@ function views_test_data_views_query_substitutions(ViewExecutable $view) {
 /**
  * Implements hook_views_form_substitutions().
  */
-function views_test_data_views_form_substitutions(ViewExecutable $view) {
+function views_test_data_views_form_substitutions() {
   Drupal::state()->set('views_hook_test_views_form_substitutions', TRUE);
 }
 
diff --git a/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/Rearrange.php b/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/Rearrange.php
index c8d8a94..c43d17c 100644
--- a/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/Rearrange.php
+++ b/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/Rearrange.php
@@ -101,6 +101,7 @@ public function buildForm(array $form, array &$form_state) {
         );
       }
       else {
+        $name = $id;
         $form['fields'][$id]['name'] = array('#markup' => t('Broken field @id', array('@id' => $id)));
       }
 
@@ -108,10 +109,14 @@ public function buildForm(array $form, array &$form_state) {
         '#type' => 'textfield',
         '#default_value' => ++$count,
         '#attributes' => array('class' => array('weight')),
+        '#title_display' => 'invisible',
+        '#title' => t('Weight for @title', array('@title' => $name)),
       );
 
       $form['fields'][$id]['removed'] = array(
         '#type' => 'checkbox',
+        '#title' => t('Remove @title', array('@title' => $name)),
+        '#title_display' => 'invisible',
         '#id' => 'views-removed-' . $id,
         '#attributes' => array('class' => array('views-remove-checkbox')),
         '#default_value' => 0,
@@ -119,11 +124,6 @@ public function buildForm(array $form, array &$form_state) {
       );
     }
 
-    $name = NULL;
-    if (isset($form_state['update_name'])) {
-      $name = $form_state['update_name'];
-    }
-
     $view->getStandardButtons($form, $form_state, 'views_ui_rearrange_form');
 
     return $form;
diff --git a/core/modules/views_ui/lib/Drupal/views_ui/ViewAddFormController.php b/core/modules/views_ui/lib/Drupal/views_ui/ViewAddFormController.php
index 7331dab..97c7ef6 100644
--- a/core/modules/views_ui/lib/Drupal/views_ui/ViewAddFormController.php
+++ b/core/modules/views_ui/lib/Drupal/views_ui/ViewAddFormController.php
@@ -91,7 +91,6 @@ public function form(array $form, array &$form_state) {
     );
     $form['name']['id'] = array(
       '#type' => 'machine_name',
-      '#title' => t('Machine name'),
       '#maxlength' => 128,
       '#machine_name' => array(
         'exists' => 'views_get_view',